Prepare the Beef:
In a large soup pot or Dutch oven, heat the vegetable oil over medium-high heat.
Add the beef stew meat and cook until browned on all sides, about 5-7 minutes.
Remove the beef from the pot and set aside.
Sauté the Aromatics:
In the same pot, add the diced onion and cook until softened, about 3-4 minutes.
Add the minced garlic and cook for an additional minute until fragrant.
Make the Soup Base:
Return the beef to the pot.
Add the beef broth, water, bay leaves, thyme, salt, and pepper.
Bring to a boil, then reduce the heat to low and simmer for 1 hour, or until the beef is tender.
Add the Vegetables:
Add the corn, carrots, and green onions to the pot.
Continue to simmer for another 20-25 minutes, until the vegetables are tender.
Make the Dumplings:
In a mixing bowl, combine the flour, baking powder, and salt.
Stir in the milk and melted butter until just combined (do not overmix).
Cook the Dumplings:
Drop spoonfuls of the dumpling batter into the simmering soup.
Cover the pot and cook for 15 minutes, or until the dumplings are cooked through and fluffy.